Dye intermediates for colour photography



infested Peb. 17, i948 I r 2,436,007

PATan/r ori-'Ica Drmufrnannm'ms Fon cocoon John Davidm Kendall and Douglas James' Fry,

Ilford, England, asslgnors to llfrd"Lmited, y Vlllford, England, a British company y L No llrawing. Application May 3, 1945, Serial No. 591,831. In Great Britain May 412,A 1944 y ss-s) 1 s .This invention re1ates,;to` colour photography carboxy, alkoxy,"carbethoxy acyl,"acylanilido, or

`and: particularly` tofzdyestuil ,intermediatesjgr nitro group, and R5 is either' agroupf'of the same -use in colour ,photographic@processes class-as' Re or is a hydrogen atoin'"o a hydrocar- Processes of colour; photographyf-a1e Welle-lil ibonfgrouxhw; .51,1 .V

known in` which zcoloured; images are-produced 5 .l :Thesescompounds'maybe prpled bryan dibn,"

'bythe developmentlof redueble silver salt images :.veni'ent, methodu suitable `method is by "e l bysmeans of aromatic primary-amino developing .condensation of 'an Varyl acetalgehyde with conru l f Y Aabove.there may .belemployedforexampla'fw I `1min-1tA isls'uitable for the particular colour .proc- .naphthyraeeraldehyee ,s-aphthylf aeetamehyoe..

" .esswithWhichvltiscintenddto be'usedi :i203 vlinethoxyphenyl 'u "fac'etaldehyde, p-chlorphe'nyl f According-to='the`pesentinventionlsaprocess 40.. cetaldehydg p-tolyl acetaldehyde, 1 ,fp-nitro offcol'olur photographylcomprisesrrdevelopinga lienylfacetaldehyde or pfethXl/Dhenyl acetabreducible silver-'salt image by means of an aroehydenfOther. compounds' for re'action there matic primary anrw.4 developing agent in the Vwith lnenrale.oyen?,mammeT and )aceto acetic;

presence of a eompoundof the general formula `fesgigsl and` alvnilid'es@` malodinitrile, Lcyaae'etpl-pigs;linoylacet estrsand'anilides', phenyl acetonitrile, diaroyll methanes, ,and quaternai'ygisalta f Y Y 'f y Y alma:@Ethyl-@cunningaorlrposltbfrdlh where R1 is an aryl group, Rz is a -CN radical. 50 Quaternary nitrgen 810m.

class consisting of the hydrogen atom -CN radicals, acyl,`acylanilido. carboxy. alkoxy, carbethoxy, nitro and hydrocarbon groups, and developing said image with an aromatic primary amino developing agent.

6. A process of colour photography which comprises forming a reducible silver salt image in an emulsion layer of a photographic element vhich contains a compound of the general forula:

Ra RI-CHT-CH=C/ Rl Where R1 is an aryl group, R2 is a group selected from the class consisting of -CN radicals. acyl, acylanilido, carboxy, alkoxy, carbethoxy, and ni` tro groups and R3 is a group selected from the class consisting of the hydrogen atom -CN radicals, acyl, acylanilido, carboxy, alkoxy, carbethoxy, nitro and hydrocarbon groups, and developing said image with an N,Ndialky1pphenylene diamine.

7. A process of colour photography which comprises forming a reducible silver salt image in an emulsion layer of a photographic element which includes, adjacent thereto, a layer containing a compound of the general formula:

6 ing said image with an aromatic primary amino developing agent.

8. A process of colour photography which comprises forrning a reducible silver salt image in an emulsion layer of a photographic element which includes` adjacent thereto. a layer containing a compound of the general formula:

where R1 is an aryl group, Rz is a group selected from the class consisting of -CN radicals. acyl, acylanilido, carboxy, alkoXy, carbethoxy. and nitro groups and R3 is a group selected from the class consisting of the hydrogen atom -CN radicals, acyl, acylanilido, carboxy, alkoxy. carbethoXy, nitro and hydrocarbon groups, and developing said image with an N,Ndia1kylpphenylene diamine.

JOHN DAVTD KENDALL.

DOUGLAS JAMES FRY.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,126,337 Mannes et al. Aug. 9. 1938 2,186,736 Schneider et al. Jan. 9. 1940 2,295,009 Porter et al. Sept. 8. 1942 2,328,652 Kirby et al Sept. 7, 1943 2,338,676 Vittum et al. Jan. 4, 1944 FOREIGN PATENTS Number Country Date 478,991 Great Britain Jan. 24, 1938 

